| 41 | } |
| 42 | |
| 43 | const std::pair<vector<Tensor>, vector<Tensor>> Split::Backward( |
| 44 | int flag, const vector<Tensor>& grads) { |
| 45 | vector<Tensor> input_grad, param_grad; |
| 46 | CHECK_EQ(grads.size(), output_size_); |
| 47 | |
| 48 | /// Input_grad is the sum of all the output gradients. |
| 49 | Tensor temp = grads.at(0); |
| 50 | for (size_t i = 1; i < output_size_; i++) |
| 51 | temp += grads.at(i); |
| 52 | input_grad.push_back(temp); |
| 53 | return std::make_pair(input_grad, param_grad); |
| 54 | } |
| 55 | |
| 56 | } // namespace singa |